Saitama’s strength is the foundation of One Punch Man, a mystery that drives the entire narrative. The series opens with a seemingly ordinary protagonist who can defeat any enemy with a single punch, yet the question of how did Saitama get so strong hangs over every scene. This journey from a powerless salaryman to the most powerful being in the universe is defined by rigorous simplicity, frustrating limitations, and the psychological cost of absolute power. Understanding his path requires looking beyond flashy powers and into the mundane reality of his training regimen.
The Origin of His Power: The 100 Push-ups Challenge
The canonical answer to "what did Saitama do to get strong" is a brutally simple routine performed during his mundane life as a job-seeking adult. Before becoming a hero, he followed a strict regimen designed to overcome his physical limits through sheer willpower and consistent exercise. This routine was not born from a desire for glory, but from a desperate need to break the cycle of a boring, unsatisfying life. The specific program he followed is the cornerstone of his extraordinary strength.
The Specific Regimen: Discipline Over Destiny
Saitama’s training was not about complex techniques or supernatural shortcuts; it was about pushing his human body past its absolute threshold. He committed to a daily schedule that stripped away all distractions and comfort. This routine is the definitive answer to the central question of his origin and serves as the catalyst for his transformation. The simplicity of the plan is what makes it so difficult to achieve.
The Rules of Progression: No Shortcuts Allowed
Beyond just doing the exercises, Saitama adhered to strict rules that governed his progression. He trained every single day without exception, regardless of weather, illness, or fatigue. This unwavering consistency is the true differentiator between his past self and his current state. The rules were designed to eliminate reliance on external factors and focus entirely on internal willpower.
He performed 100 push-ups, 100 sit-ups, and 100 squats every day.
He ran 10 kilometers daily, pushing himself to reach the destination as quickly as possible.
He restricted his diet, eating only cheap, simple food to maintain discipline and avoid lethargy.
He avoided using air conditioning or heat, subjecting his body to environmental stress.
He refused to use any supplements, gadgets, or special techniques.
He trained through pain and exhaustion, treating every workout as a battle.
The Trade-off: Losing What Made Him Human
While the routine explains the physical mechanism of his strength, it doesn't capture the full cost. Saitama did not just gain power; he lost something integral to his former life. The intense focus required to achieve such a state created a psychological transformation that is just as significant as the physical one. He became strong enough to destroy planets, but he can no longer feel the thrill of a challenge.
